package com.shangye.miaoSha.redis;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;


@Service
public class RedisService {
    @Autowired
    JedisPool jedisPool;

    public <T> T get(KeyPrefix prefix, String key, Class<T> clazz){
        Jedis jedis = null;
        try{
            jedis = jedisPool.getResource();
            // 生成key
            String realKey = prefix.getPrefix() + key;
            String str = jedis.get(realKey);
            T t = StringToBean(str, clazz);
            return t;
        }finally {
            returnToPool(jedis);
        }
    }

    public <T> boolean set(KeyPrefix prefix, String key, T value){
        Jedis jedis = null;
        try{
            jedis = jedisPool.getResource();
            String str = beanToString(value);
            if(str == null || str.length() <= 0){
                return false;
            }
            String realKey = prefix.getPrefix() + key;
            jedis.set(realKey, str);
            return true;
        }finally {
            returnToPool(jedis);
        }
    }

    public <T> boolean exists(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.exists(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 增加值
     * */
    public <T> Long incr(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.incr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    public <T> Long decr(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.decr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    private <T>  String beanToString(T value){
        if(value == null){
            return null;
        }
        Class<?> clazz = value.getClass();
        if(clazz == int.class || clazz == Integer.class){
            return ""+value;
        }else if(clazz == String.class){
            return (String)value;
        }else if(clazz == long.class || clazz == Long.class){
            return ""+value;
        }else{
            return JSON.toJSONString(value);
        }
    }

    @SuppressWarnings("unchecked")
    private <T> T StringToBean(String str, Class<T> clazz){
        if(str == null || str.length() <= 0 || clazz == null){
            return null;
        }
        if(clazz == int.class || clazz == Integer.class){
            return (T)Integer.valueOf(str);
        }else if(clazz == String.class){
            return (T)str;
        }else if(clazz == long.class || clazz == Long.class){
            return (T)Long.valueOf(str);
        }else{
            return JSON.toJavaObject(JSON.parseObject(str), clazz);
        }
    }

    // 将用掉的连接返回连接池中
    private void returnToPool(Jedis jedis){
        if(jedis != null){
            jedis.close();
        }
    }


}
